Attachment for stone-planing machines



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ATTACHMENT POR STONE PLANING MAGHINBS.

N6. 566,671. Patented May 26, 1696.

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Y o. A. THOMSON. ATTAGHMBNT FOR STONE PLANING MACHINES.

No. 566,871. 'Patented May 26, 1696.

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Nirnn A NSrnrns PATENT OFFICE.

CHARLES A. THOMSON, OF NEVARK, NEV JERSEY.

ATTACHMENT FOR STONE-PLANING MACHINES.

SPECIFICATION forming part of Letters Patent N0. 560,871, dated May 26,1896.

Application iiled June 8, 1895. Serial No. 552,070. (No model.)

To a/ZZ whom, it may concern:

Be it known that I, CHARLES A. THOMSON, a subject of Her Majesty theQueen of England, residing at Newark, in the county of Essex and Stateof New Jersey, have invented certain new and useful Improvements inAttachments for Stone-Planing Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the saine, reference being had to the accompanyingdrawings, and to letters of reference marked thereon, which form a partof this specification.

The objects of this invention are to enable curves to be planed uponstone with greater facility, to reduce the space heretofore required inplaning such curves, to enable curves of greater radius to beconveniently planed in stone, and to secure other advantages andresults, some of which will be re ferred to in connection with thedescription of the working parts.

The invention consists in the improved stone-cutting machine and in thearrangements and combinations of parts, all substantially as will'behereinafter set forth, and finally embraced in the clauses of the claim.

Referring to the accompanying' drawings, in which like letters indicatecorrresponding parts in each of the views, Figure l is a plan of theimproved machine. Fig. 2 is a similar view showing the parts indifferent positions. Fig. 3 illustrates a modiiication of construction,and Fig. 4t is a vertical transverse 4section showing the relation ofthe parts more clearly.

In said drawings, d indicates a suitable bed or frame, upon which isarranged a table b, which slides on suitable ways or bearings, forced bya screw-shaft c and a belt and pula ley CZ d or other suitable gearingin any man ner common in stone cutting or planing machines. Above thetable is the usual transverse slideway e, on which are arranged thesaddle f and tool carrier or holder g, which parts are operated byhand-screws h and i, also in any manner common in the art.

g' indicates the cutter. j

Other suitable means for operating the table and adjusting the cuttercommon in the stone-planin g art other than those shown may be employedwithout departing from the invention.

I'Ieretofore it has been common, in connection with such a sliding tableas I have referred to, to employ means for producing curved lines instone-cutting; but for various reasons such means have been open toobjection, in that in some cases it was necessary to provide a center ata distance from the machine upon which the stone was turned when beingplaned. This involved the consumption of a large amount of yard-space.The results secured when long radial guide-bars were eniployed were alsoimperfect because of the vibrations of the bar and the consequentirregular movements of the stone when subjected to the cutter.

Other methods and means provided have each presented practical objections-such, for example, as in certain cases where the tool changedits angle to the curved line of the stone because of a straight movementof the stone and a straight transverse movement of the cutter, thechange in the relation of the cutter to the curved surface being cuttended to produce a difference in the effect of the cutting edge on thestone. In other cases, again, the machines required the interchange ofpatterns or specific guides to produce the variations required inordinary practice, so that a large variety of patterns or guides wererequired. These objections and others are avoided by myimproved machine,by which by simply adjusting the guide-bar I may cut into the stonecurvatures, whose concavities face in opposite directions, curves withradii of various lengths, and should plane surface be desired I can cutthem by simply making the required parallel adjustment of the parts.

Again referring to the drawings, j indicates a supplementarytable, whichis pivoted. upon ,the table b at 7c and is furnished at one end with aslotted arm or extension Z and with Adjacent to said extension the tableb is IOO ably having an antifriction-roller. Said pin and its rollerwork in the slot of the eXtension Z of the supplementary table. Back ofthe table b, on suitable bearings of the frame a, such as q q q, is alongitudinally-grooved lever r, which is fulcrumed, as at s, andreceives apin and its rollert of the transverselysliding bar o.

The guide bar or lever 0' may be adjusted so as to lie parallel with theline of movement of the sliding table Y) or be disposed at variousangles thereto, the divergencies being either toward one end of thetable or the other to change the curvature, so that the concavity willface in a reverse direction, if desired.

Means are provided for clamping or Xing the grooved bar, and itsadjustment is facilitated by a scale u, Fig. l, of graduation-marks uponone of the bearings qof the frame or on any other suitable member of themachine, by which scale the working parts may be adjusted to planeacurve of any desired radius upon the block of stone. On arranging thegrooved bar r parallel with the direction of movement of the table bwhen said table and its supplemental table j are moved on the ways a,the transverse arm o also moving with said table a, the roller t willsimply travel through the groove 0" without occasionin g any secondarymovements; but by inclining said bar r more or less to said line ordirections of movement of the table a the bar 0 is forced to movetransversely in the groove of the table a and produce a secondarymovement of the supplemental table 7' on its pivot or fulcrum. Thismovement is of course transmitted to the stone fm., resting upon thetable. The slot or groove in the arm or extension Z, in which the pin orroller p of the transversely-moving bar works, allows the pivotalmovement of the supplemental table and prevents any binding of parts.The greater the inclination of the bar r to the line of movement of thetable the shorter will be the radius of the curve. By a slightinclination of said bar a curve of a long radius will be produced.

It will be evident that by means of the stationary cutter (stationaryafter being properly adjusted by the means described) and thepivotally-movable stone said cutter, when once brought to theinclination proper to produce the desired cutting or planing, willmaintain a uniform inclination to the curved line, and the cutter willproduce a uniform. cutting effect and will not bruise the stone becauseof an improper relation of said tool to said stone.

In Fig. 3 I have shown a variation in the construction of the invention.Here the guidebar is made wider, and the groove therein is not straight,but is more or less irregular to effect a desired variation in thecurve. Here alsov I have shown the supplemental table linked to thetransversely-movable bar.

Other changes may be employed of a mechanical nature without departingfrom the spirit or scope of the invention.

Having thus described the invention, what I claim as new is- 1. In astone-cutting machine, the combination with the sliding andtransverselygrooved table, b, and means for moving the same, a cutterand means for adjusting the same, of a supplemental table pivoted onsaid table, b, a guide-bar, o, adjustable in its relation to said table,b, a transversely-movable bar arranged in the groove of the table b, andengaging the guide-bar and movable longitudinally thereby and alsoengaging the supplemental table and turning the same pivotally when thusmoved longitudinally, substantially as set forth.

2. In a stone-cutting machine, the combination with thehorizontally-movable table l), and means'for operating the same and acutting-tool, of a supplemental table pivoted at one side of, andmovable with the table I), and having at one end a slot in which aprojection of a connecting bar or rod, o, may work, an adjustableguide-bar r, pivoted or fulcrumed at a point distant from said table l),and adapted to be changed in longitudinal relation to the line ofmovement of said table, so as to either lie parallel with said line ofmovement, or at angles thereto, the divergences being in either of thetwo opposite direct-ions to produce either straight or curved planingcuts, the latter being any of a variety of radii or of either of thereverse directions, substantially as set forth.

3. ln a stone-cutting machine, the combination with a frame and table,b, movable thereon, a screw for operatin g said table and means forturning said screw, a slotted supplemental table pivoted upon the firstsaid table, a bar arranged transversely upon the first said table, andhaving rollers engaging said slotted table, and a guide-bar, and saidguide-bar stationed back from the table, l), substantially as set forth.

4. The combination, in a stone-cutting machine, of the straight andpivotally-movable table, j, having a slotted extension, I, and means forsecuring the stone thereon, a bar, o, movable at right angles to thedirection of straight movement of said table and having a pin or roller,p, working in the slot of said extension, an adjustable slotted orgrooved guide-bar, r, and a pin or roller, t, arranged on the bar, o,and working within the slot or groove of said guide-bar, a cutter, andmeans for operating said parts, substantially as and for the purposesset forth.

In testimony that I claim the foregoing I have hereunto set my hand this5th day of June, 1895.

CHARLES A. THOMSON.

lVitnesses:

OLIVER DRAKE, CHARLES H. PELL.

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